Part Number 000015432 Rev02 5/21 73
ANALYZING SUCTION PRESSURE
NOTE: Analyze discharge pressure before analyzing suction
pressure.
High or low discharge pressure may be causing high or low
suction pressure.
Suction Pressure High Checklist
Problem Cause
Improper
installation
Refer to “Installation/Visual Inspection Checklist.”
Discharge
pressure
Discharge pressure is too high and is affecting
suction pressure. Refer to “Discharge Pressure
High Checklist.”
Improper
refrigerant
charge
Overcharged
Wrong type of refrigerant
Non condensible in system
Other
Dump valve leaking
Non-Manitowoc components in system
Expansion valve incorrectly adjusted
Defective compressor
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